US1240257A - Telephone system. - Google Patents

Description

F. N. REEVES & A. E. LUNDELL.

TELEPHONE SYSTEM.

APPLICATION FILED JAN. 20. 1916.

Patented Sept. 18, 1917.-

3 SHEETS-SHEET I.

lm/en fors: Han/r lV. Ree z/es A/ben E. Luna's/A F. N. REEVES & A. E LUNDELL.

TELEPHONE SYSTEM. APPLICATION FILED JAN. 20. 1916.

Patented Sept. 18,1917.

3 SHEETS-$HEET 2.

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F. N. REEVES & A. E. LUNDELL. TELEPHONE SYSTEM.

APPLICATION FILED JAN- 20,19l6.

Patented Sept. 18, 1917.

3 SHEETS-SHEET 3.

Alba/7 tlLunde/f UNTTEE 8TAES TEN OFFTOE.

FRANK N. REEVE$, OF NEWARK, NEW] JERSEY, AND ALBEN E. L'UNDELL, OF NEW YORK, N. Y., ASSIGNORS T0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A-COBPOEATION OF NEW YORK.

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Patented Sept. 18, rear.

Application filed'l'anuary 2c, 1916. Serial No. 73,223.

To all whom it may concern.-

Be it known that we, FRANK N. Rnnvns and Ancient E. LUNDELL, citizens of the United States, residing at Newark, in the county of Essex and State of New Jersey, and at New York, in the county of Bronx and State of New York, respectively, have invented. certain new and useful Improve ments in Telephone Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone systems in whicha connection is extended to a wanted line by means of electrically operated switching devices, and particularly to systems of this kind in which a plurality of substations are associated with certain of the lines.

The principal object of the present invention is to provide means by which any one of a plurality of substations on a line may be selected and rung without the transmission of an additional series of impulses from the sending or controlling device, and in which said line has but a single set of terminals at each of the switches having access thereto.

Other objects and advantages which are dependent upon or result from the feature above noted, will appear as the description of the invention progresses.

In the drawings, Figures 1, 2 and 3', with Fig. 9- between Figs. 1 and 3. diagrammatically indicate the apparatus employed and so much of the circuits as is necessary for a clear understanding of the present invention.

The selector switches employed 'may be substantially of the structure and operation of those disclosed in patent to McBerty No. 1,125,57 9. This patent also shows in a gen eral way the type of sending apparatus employed in the present invention; the manner in which said sending device may be associated with a selected cord circuit; and the operation of the circuits in controlling the setting up of a connection through the switches shown at the right in Figs. 2 and 3 respectively. 1

The sequence switches employed herein will preferably be of a character such as that disclosed in patent to Reynolds and Baldwin, No. 1,127,808. Three of these sequence switches are illustrated in the draw-- ings. Sequence switch 100 is provided to control the circuits of the operators sending device,"sequence switch 200 controls the circuits for the selector switch illustrated in Fig. ,2; and sequence switch 300 controls the operating circuit for the connector switch shown in Fig. 3.

. Each of the sequence switches is provided with a controlling or master contact, which, in each instance, is illustrated immediately above the power magnet of the switch. These master contacts are closed at all positions except those indicated by the numerals adjacent thereto. These numerals therefore indicate the only positions in which the sequence switch. can stop. The other sequence switch contacts, which are diagrammatically illustrated in various portions of the drawings, are closed only at the positions indicated by the numerals adjacent thereto. The sequence switch contacts, which are controlled by the sequence switches, will in each instance be indicated by reference characters; the hundreds digit of which are the same as the hundreds digit of the sequence switch to which they belong. The reference characters applied to Fig. 1 will all be below 200; these applied to Fig. 2 will each have 2 as the hundreds digit; and those applied to Fig. 3 will each have 3 to the hundreds digit.

At the left in Fig. 1 is diagrammatically indicated a portion of the register contacts of the operators sending device. This sending device may be substantially of the type shown in the patent to McBerty 1,167 ,64'r6.

The principal difference of the register of the present in ention and those illustrated in said patent is that, in the present case, two sets of register contacts are provided for the thousands and tens registers, also an additional register which we will term a stations register is employed. Counting relays will be provided at the operators sending device similar to those described in the patent to McBerty 1,167 ,646 before mentioned or substantially as shown in the patent to Molina 1,039,988. Only the number 15, number let, and the number 0 pairs of relays are shown in the drawing.

One of the sets'of register contacts of the thousands and tens registers will be connected to the counting relays in the usual manner. These are the lower two sets of registion.

With the foregoing explanation of the mechanism and means employed, it. is believed that the present invention will be readily understood from a description of the manner in which a connection isestablished to a wanted line and one of the substations on said line is selectively signaled,

We will assume that the cord circuit shown in Fig. 1 has been connected with the line of station A by inserting the plug 1 in the line jack of said station, that the operators equipment has been associated with.

said cord circuit by means of the sender cord finder diagrammatically indicated adjacent to the reference character 20, and that the first or, district selector switch, the brushes of which are indicated by the reference characters 21, 22 and 23 at the right in Fig. 1, has been connected to the terminals of the trunk line extending to Fig. 2. All this may occur in a manner similar to that diss closed. in the McBerty Patent 1,167,646.

In the following description, a reference character indicating a sequence switch contact Will'be followed by a numeral in parenthesis which will indicate the position occupied by the sequence switc'h controlling the contact at the time the circuit is traced.

At this. time the sender controlling sequence switch 100 will have moved to. position 6., and sequence switch 200 will-be in normal or position 1. A circuit will now be completed from battery through relay 202, lower sequence switch contact 203 (1), over the upper trunk conductor, through brush 21, sequence switch contact 16, the left brush of the finder switch 20, through the armature and back contact of counting relay 105, the winding of stepping magnet 102, sequence switch contact 103 the right brush of switch 20, lower sequence switch contact 17, brush 22, lower sequence switch contact 204 (1) to ground. Relay 202 is energized and completes a circuit from battery through the motor magnet of sequence switch 200, upper, left sequence switch contact 205 1), throughthe front contact and right armature of relay 202 to ground. Sequence switch 200 is carried. to position 3 by its master contact 201.. When lower contact 203 (1) is opened as the sequence switch 200 moves from position 1 to position 3, re lay 2,02 will be maintained energized by a The upper sets of parallel path through its contact and left armature and upper left contact 203 (3).

lVe will also. assume that the thousands and tens register have been set to close their contacts at positions 5 and 1 respectively, and that the stations register contacts 18 and 19 have been actuated to close their upper contacts and thus render the upper set of register contacts of the thousands and tens registers operative. It will be remembered that the contacts of these registers were connect-ed to the counting relays so as to send ten more impulses thanthe corresponding contacts of the normal registers or the two. which are positioned just below them, Therefore contact 5 of the 1000s register will be connected to the No. 15 or sixteenth pair of counting relays-and contact 1 of the 10s register will be connected to the No. 1 1 or the fifteenth pair of count; ing relays. no way affected by the selecting operations other than those governed bythe 1000s, and 10s registers, the contacts of the other registers have not been indicated on the draw: ing and the operations which would be governed thereby will not be described. v

In position 3 of sequence switch 200, a circuit is completed from battery through the clutch magnet 206 of the brush selecting Shaft 207, sequence switch contact 208 (3.), and front contact and right armature of relay 2.02 to ground. tripping spindle 207 to rotate. As it leaves its normal position, contacts 209. are closed and remain closed until the spindle 207 has made a complete revolution. Contacts 210, however, are closed each time the spindle moves from one position to the next.

When the fundamental stepping circuit was first closed, stepping relay 102, in attracting its armature, completed a circuit from ground through its contact and arms ture, sequence switch contact 104 (0) upper stations register contact 18 to the multiply connected thousands register contacts, and thence through thousands register contact #5, armature and back contact of relay 15, and the winding of relay 15 to battery lVhen relay 15. attracts its armature it completes for itself and relay 15, a series circuit extending tov ground through contact 106 (6). R lay 15 is however short-circuited at this time by the ground connection through the armature and contact of relay 102.; Now, when contact 210 is closed, as the spindle 207 moves to its next brush tripping position, a short circuit of relay 102 will be provided from contact 203 (3), contact 211 (3) and contacts 210 to ground. This will cause the deenergization of relay 102, which will remove the shunt from relay 15, and it will pull up and lock up. in a manner clearly explained in the patent to McBerty 1,167,646. The above ,rnentioned path to ground As the present invention is in This causes the brush- The spindle 207 will continue to rotate,

causinga short circuit of the stepping relay 102 for each brush tripping position through which it passes. With each energization and deenergization of relay 102, a pair of the counting relays will be energized and locked up; and when the spindle 207 has made a complete revolution, contact 210 will have been closed ten times and ten pairs of counting relays will have been energized and locked up; but as the number 15 pair of relays were first operatedselection will not be interrupted at this time. Relays 0 and 0 indicate the last or No.- 0 pairs of counting relays. Thus, when stepping relay 102 attracts its armature for the sixteenth time, due to the fifteenth opening of contact 210, relay 0 will be energized and will close a circuit through relay 105 and relay 15 in parallel and thence to ground through front contact of relay 0 and upper contact 106 (6). Relays 105 and 0 will not be energized however at this time due to being shortcircuited by the lead to ground through the armature and contact of relay 102. When, however, relay 102 retracts its armature for the sixteenth time, it will remove the short circuit about relays 105 and 0', and they will pull up and lock in the previously traced circuit. Relay 105 will interrupt the fundamental circuit through relays 102 and 202. Relay 202 will not be denergized until the next opening of contacts 210 when it will retract its armature and open the circuit of clutch magnet 206.

When the spindle 207 moved from its normal position and closed contacts 209, a circuit was closed from battery through relay 212, left armature and contact of relay 213 and contacts 209 to ground. Relay 212 attracted its ari'natures and prepared a circuit for itself in series with relay 213, which circuit extends to ground through the front contact and right armature of relay 212, and upper left sequence switch contact 21 1 v(3). However, during the complete rotation of the spindle 207, relay 213 will be short-circuited by thegroundapplied through contacts 209. When, however, the spindle 207 has made a complete revolution, contacts 209 will open, removing the shunt from relay 213 which will pull up and lock up in series with relay 212.

The relay 213 controls the polarity of ringing current which will be applied to the called line. If the spindle 207 makes less than a complete revolution, relay 213 will not be energized, and ringing current of negative polarity will be applied through the back contact and right armature ofthis relay. If, however, the spindle 207 makes a complete revolution, or more, relay 213 will be energized and locked up, and positive ringing current will be supplied through the front contact and right armature of this relay. H

Nhen relay 0 was energized as, above described, it completed a circuit from battery through sequence switch 100, contact and armature of relay 0, and lower sequence switch contact 106 to ground, thus moving sequence switch 100 out of position (3. In moving out of position 0 upper contact 106 (0) is opened, and the holding circuit for thecounting relays is interrupted. As we are not concerned with the stages of selection between the brush selection at the selector, shown in Fig. 2, and brush selection at the connector shown in Fig. 3, we will next assume that sequence switch 100 hasbeen carried to position10 during the intermediate selections whichlake place between the above noted brush selecting operations.

l/Vhenr'elay 202 retracted its armature at the end of the brush selection, it completed a circuit from battery through sequence switch 200, lower sequence switch contact 205 (3), and the back contact and .right armature of'relay 202 to ground, thus moving sequence switch 200 to position In position htrunl'r-hunting takes place, a circuit being completed from battery through the switch motor magnet 215, sequence switch contact 216 (at) back contact and armature of relay 217, and sequence switch contact 214 to ground. The test terminals of idle trunk lines are supplied with full battery potential while the test terminals of busy trunk lines will be supplied with low battery potential or ground.

Associated with the selector switch and moving therewith, is a brush 213 which is arranged to engage one of the teeth of the grounded plate 219 each time the switch is in transit from one set of contacts to the next. Now when the switch brushes engage the contacts'of an idle trunk, a circuit will be completed from battery over the lower or test conductor of the trunk, through the corresponding switch brush, conductor 220, the right or high resistance winding of relay 221, sequence switch contact 222 (1), brush 21S, and segment 210 to ground. Relay 221 will attract its ar1nature, thus completing a low resistance shunt through its left winding about the highresistance right winding. A circuit is now completed for relay 217 from the armature and lower contact of relay 221 through the winding of relay 217 and sequence switch contact 21 1 1), to ground, but, due to the shunt through interrupter brush 218, relay- 217 is not operated until the switch brushes are centrally positioned on the contacts of the trunk. When brush 218 disengages the conducting strip219, relay 217 will attract its armature, opening at its back contact the circuit for motor magnet 215, and at its front contact completing a circuit from battery through sequence switch 200, sequence switch contact 223 (a), front con tact and armature of relay 217, and upper right contact 2141 (4) to ground. The sequence switch 200 thereupon moves out of position 1.

l/Vhile sequence switch 200 is being moved through positions 5 and 6 to position 7, selection will take place at the selector switch indicated by the brushes 302, 303 and 304: at the left in Fig. 3. This is part of the operation which was previously described as causing the sender sequence switch 100 to move from position 6 into position 10.

We will now assume that the call has been extended through to the connector switch shown at the right in Fig. 3, that sequence switch 200 is in position 7, and sequence switch 100 is in position 10. WVhen sequence switch 100 reaches position 10, a circuit will be closed from battery through relay 202, lower right contact 203 (7), over the upper talking conductor, brush 21, lower contact 16, armature and contact of relay 105, relay 102, contact 103 10), lower contact 17, brush 22 and lower contact 201 (7 to ground. Relays 102 and 202 will both be energized. As we assumed that the tens vregister was in position 4 and that upper contact 19 of the stations register is closed, relay 102 will complete a circuit from battery through counting relay 14, contact and armature of relay 14, contact 4 of the upper set of tens register contacts, upper contact 19 of the stations, register, sequence switch contact 116 (10) and the armature of relay 102 to ground.

Relay 202 will complete a circuit from battery through the motor magnet of sequence switch 200, upper left contact 205 (7) and front contact and right armature of relay 202 to ground. Sequence switch 200 will move to position 8. When lower contact 203 (7) is opened as the sequence switch moves to position 8, relay 202 will be maintained energized by a parallel path through its contact and left armature and upper left contact 203 (8). Sequence switch 300, being in position 1, a circuit will be com .pleted fro-m battery through relay 305, up-

per sequence switch contact 306 (1), brush 302, over the upper trunk conductor, through sequence switch contact 22 1 (8), to the front contact and right armature of relay 202 to ground. Relay 305 will attract its armatures and complete a locking circuit for itself through its leftarmature and lower contact 306. It also completes a circuit from battery through sequence switch 300, contact 307 (1), and the front contact and right armature of relay 305 to ground, thus moving sequence switch 300 out of position 1 and to position 3 under the control of its master contact 301. A circuit now extends from battery through the brush selecting clutch magnet 308, sequence switch contact 311 (3), and the front contact and right armature of relay 305 to ground. Magnet 308 will be energized and will cause the brush tripping spindle 312 to rotate. .The contact 309 associated with said spindle will be closed at all times except when the spindle is in its normal position. Contact 310 will be closed each time the spindle passes from oneposition to the next. Contacts 309 and 310 are similar ino-peration and in function to the contacts 209, and 210 of the selector switch of Fig. 2. l/Vhen contact 309 is closed, a circuit is completed from battery through relay 313, back contact and lower armature of relay 31a, and contacts 309 to ground. Relay 313 pulls up and completes a circuit from battery through its own winding, contact and left armature and the winding of relay 314 to ground through sequence switch contact 315 (3). Relay 314 will not be energized, however, as it is short circuited through contacts 309.

During the sending of the impulses, a cir-' cuit extends from battery through relay 202, left armature and contact, upper left contact 203 (8), over the upper trunk conductor, brush 21, lower sequence switch contact 16, armature and contact of relay105,relay 102, sequence switch contact 103 (10), lower sequence switch contact 17, brush 22, and lower sequence switch contact 204 (8) to ground.

lVith each closure of the contact 310, a shunt is established about relay 102 which extends from unction point 226 (above relay 202) sequence switch contact 227 (8), the lower talking conductor of the trunk, brush 303, contact 319 (3), and contacts 310 to ground. The repeated energization and de energization of relay 102, clue to the opening of this shunt by contacts 310, will cause successive pairs of counting relays to be energized and locked up in the manner described in connection with the operation of the thousands registers until the brush selecting shaft 312 has made a complete revolution and has taken five additional steps, when the last or number 0 pair of relays will be operated. l V hen the brush selecting shaft 312 passed through normal position, the contacts 309 were momentarily opened, thus removing the shunt from about relay 31 -l, which then became energized and locked up in series with the relay 313 over the previously described circuit. Shaft 312, however, continues its rotation until the contacts 310 have been closed and opened 15 times, thus causing fifteen pairs of counting relays to be energized and locked up. With the 15th closure of contact 310, relay 0 and relay 105 will be energized as before described. Relay 0 will close a circuit for sequence switch 100,

causing it. to moveout of-position 10 and into units selecting position. As the method of eii'ecting units selection playsno part in the present invention, this sequence switch position has been omitted from the master contact 101 of sequence switch 100, but we will assume that switch 100 moves to some position between 10 and normal, and is moved to its normal position at the end of units selection.

Relay 10min attracting its armature, interrupts one branch of the circuit for relay 202.- opened, relay 202 is deprived of current and retracts its armature, interrupting at its front contact and right armature the holding circuit for relay 305, which falls back, opening'at its right armature. and front contact the circuit of motor magnet 308, and closing at its back contact a circuit for motor magnet 300 through sequence switch contact 30? moving sequence switch 300 from position 3 to position 1. When the circuit of magnet 308 was opened, spindle 312 stopped in a position to trip the set of connector switch brushes having access to the row of contacts in which the wanted line terminates. Relay 202 at its right armature and back contact completes a circuit from battery through the motor magnet of sequence switch 200 and contact 205- (8),

causing the sequence switch 200 to move to position 0. I I

Units selection. that 1s selection of the subscribers line shown in Fig. 3, will take place in the usual and well-known manner.

clay 202 will he, againoperated to control units selection through relay 305, and thus switch 200 will be moved to posisequence tion 10 The energization of relay 305 es tal nes a circuit from battery through sequence switch motormagnet 300, contact 307 (4:). front contact and right-hand armature of relay 305 to ground, whereby sequence switch. 300 is moved into position 6; At the end ofunits selection, relay 305 will again front contact and lower armature of relay" -7 Thus sequence switch 300 will move out of position 13 and to position '14.

In moving from position 13't0 position l it. will be noted that the talking con- 3 to ground through contact 309.

luctois are reversed or crossed at contacts 316 and 3.17: that is, the lowermost conductor "from brush 303 will be connected through contact 1 1) to the upper conduc tor or the upper Milking-brush of the connector switch, and the upper-conductor at brush 302 will be connected through-contact 317 QM) to the talking strand extending to the Now when the contact 310 is next tion of units selection, the cord sequence switch (not shown) operates to open lower sequence switch contacts 16 and 17, and. close upper contacts 16 and 17. A circuit will now extend from the cord battery in Fig. 1 through lower right winding of the repeatingcoil. upper contact 17. brush 22, contact 204: (11 to 14.), the useits winding of repeating coil 230, right winding of relay 231, contact 203 (11 to 14C), brush 21 and upper contact 16 back to battery.

Relay 231 is-energized and completes a circuitt'rom battery through ringing relay 232, lower armature and back contact of relay 233, armature and back contact of ringing cut-off relay 23a to ground through the armature and "front conta-ctoI" relay 231. A

circuit is also completed for relay 235 which is. held up until it is operated to effect the 7 release of the selector switch of Fig. 2 upon the termination of the conversation. The

above circuits will be completed and the re-- lays energized before switch 200 reaches position 14. It will be noted that relay 233 is shunted by its own armature and contact, and the armature and contact of relay 23 i, and consequently will be operated when relay 234: attracts its armature.

We assumed that the tripping spindle 207 01 the selector switch of Fig. 2 made more than a complete revolution, and as the ringing polarity control relay 213 is therefore energized, positive ringing current will flow through its right armature and front contact. the winding of relay 234, front contact and armature of relay'232, sequence switch contact 227 (14:), over the lower talk- 7 ing conductor to brush'303, upper armature and contact of relay 314, contact 316 (14:) to the upper talking vconductor, and thence through the connector switch to the right conductor of the multi-party line shown in Fig. 3. Four subscribers stations, at, 7), 0, and Z are associated with this line and this current will find parallel paths through the ringing control relays a. 7), c, and cl of the several stations respectively,to the left conductor '01" the line and thence back through the connector switch, the lower .trun'k conductor, contact 317 (14), brush 302', the upper trunk conductor'andcontact 224 1 k) to ground through the upper armature and back contact of relay 233. Relays a, b, c and cl will all be energized. The ringing devices or bells of stations at and b are-arranged to be connected between the left talking conductor and ground by their relays a and b, respectively, and the ringing devices at stations 0 and cl are arranged to be connected with the right talking conductor by their relays 0 and cl. The bells of stations a and 0 are arranged to respond to positive ringing current while the bells of stations Z) and cl respond to negative current. Thus as positive ringing current is supplied to the right talking conductor the signal at station 0 will be operated.

lVhen the called subscriber removes his receiver from the hook, the resistance in the circuit will be decreased and suflicient current will now flow through relay 23a to cause it to attract its armature. This will interrupt the shunt about relay 233, which in attracting its armature completes a locking circuit for itself and at the same time shunts relay 232, causing it to retract its armature. Relay 233 being up and relay 232 being retracted, the talking circuit is not complete from the calling to the called subscriber.

If the stationsregister had been so adjusted that lower contact 18 was closed, the

,lower set of 1000s register contacts would have been operative in controlling the brush selection at the selector switch of Fig. 2."

Thus the tripping spindle 207 would have made less than a complete revolution and relay 213 would not have been energized. This would result in supplying negative ringing potential to the right side of the line to cause the operation of the signal of subscriber cZ. been so operated so as to close lowerrcontact 19, the sender would have been satisfied by less'than ten impulses. Thus contact 309 of the tripping spindle 312- would not have been opened and relay 314 would not have been energized, and sequence switch 300 would have stopped in position 13. Thus no transposition of the talking conductors at contacts 316 and 317 (13) would have occurred. Ringing current would now be supplied to the left side of the subscribers line to operate the signal of station a or of stationb, dependent on whether the stations register contact 18 was closed at its upper or its lower contactto determine whether the brush selecting spindle 207 would make more or less than a completerevolution. If

lower contact 8 is. closed asbefore described,v

spindle-207 would make less than a complete revolution and'rel'ay 213 would remain de energized, supplying negative ringing current to the left talking conductor of the subscribers line to operate the signal at station 6.. If, however, stations register was operatedto closeupper contact 18, the spinerate the signal device of station a.

if the stations register haddle 207 will have made more than a complete revolution, relay 213 will have been energized and positive ringing current will be supplied to the left talking conductor to op- It is thus evident that any one of the four stations on the party line may be selectively signaled without the use of an additional series of selectii'ig impulses, and without the necessity of providingthe connector switches with a set of contact terminals for each station on the line. By this arrangement the time of establishing the connection is shortened and a saving is effected in the line multiples at the connector switches.

The invention herein disclosed may be readily modified for use with switching de vices which differ greatly in structure from the multiple brush rotary switch to which ,it is applied in the present disclosure. It is obviously applicable to multi-brush step-bystep switches similar in' character to that shown in an application of Oscar F. Forsberg, Serial No. 6802, filed February 5, 1915. It is also readily adaptable for use with power driven switches such as shown in. patentto Craft and Reynolds, No. 1,123,(596. In fact, those skilled in the art will readily devise means for applying the invention to almost any desired switching mechanism.

Since the present invention is in no way concerned with the manner of restoration of the switches employed, the restoring action will not be described.

What is claimed is: 1. In a telephone system, a calling line, a

called line, a plurality of stations on said terminals of said line.

2. In a telephone system, a telephone line, means including an electrically operated selecting device for extending a connection to said line, a plurality of series of correspond ing selecting positions for said device, said device being arranged to effect the same connection when moved to any of its corresponding positions, a source of current, and means responsive to the movement of said selecting device to different, but correspond ing'positions for differently applying said current to said line.

3. Ina telephone system, a telephone line, means including an electrically operated selecting device for extending a connection to said line, two series of'corresponding select 1 ing positionsior saiddevice, said device being arranged to effect the same line selecting operation when moved to either of its corresponding positions, a source of current, and means dependent on whether said selecting device is positioned in one of its first or second series of positions for dilierently applying said current to said line.

4-. In a telephone system, a telephone line, means including an electrically operated switch controlling device for extending a connection to said line, a plurality of series of corresponding selective positions for said device, said device being arranged to effect in corresponding positions the same switching operation, a source of current; and means dependent on to which of its corresponding positions said selecting 7 device has been moved for differently applying said current to said line.

5, In a telephone system, a telephone line, means including an electrically operated switch for extending a connection to said line, a plurality of brushes on said switch, a brush selecting device having a plurality of selecting positions corresponding to each of said brushes, a source of current, and-means dependent on whether said brush selecting device has been moved to one or another of its corresponding selecting positions fordifferently associating said source with said line. v p

6, in a telephonesystem, a telephone line,

means including an electrically operatedswltch for extending a connection to said line, a plurality of brushes on said switch. means for selecting a'desired one of said brushes, said means being dilierentlvoperative to select the same brush, source of current, and means dependent on the manner in which said brush selecting device is operated for differently associating said source with said line. i

7. In a telephonesystem, a telephone line, means including an electrically operated switch for extending a connection to said line, a pluralitvof brushes on said switch, a brush selecting device, means for moving said selecting de-vicethrough a pluralitv pf cycles of corresponding selecting positions, a source of current, and means dependent on. whether said brush selecting devlce has been] moved through more or less than one of its cycles of positions for differently associat-' ing said source with said line. I

8. In a telephone, system, a telephone line,

' means including a switching device for extending-a connection to saidline, electricallyzoperated means for movlng said device through a plurality of seriesoit' select ing-positions, said device being arranged to effectthe same switching operation when in vac-h of 1ts' corresponding positionsin said series, a source, of current, and 'means con of being moved through a plurality of cycles of selecting positions, the selection accomplished at corresponding positions of said cycles being the same, a source of current, and means dependent on whether said selecting-device passed through. more or less than a complete cycle of positions for differently applying said current to-said line.

10. In a telephone system, a telephone line, mean's including a multi-brush switch for extending a connection to said line, brush selecting means at said switch capa'ble of being moved through a plurality of cycles of brush selecting positions, the brushes selected at corresponding positions ofsaid cycles being the same, a source of current, and meansdependenton'whether said selecting device passed through more or less than a completed cycle of saidposiy ti ons for differently -11. In atelephone ,ystem, a telephone line,;means including amulti-brush switch for extending a connection to said line, a rotatable brush vselecting device at said switch capable of being moved through. a plurality 01"? cycles of selecting positions, the brush selected at corresponding positions of said cycle being the same, a. source of current, and means dependent on whether said selecting device passed through more orless than avcomplete cycle otpositions for differently applying said current to said line.

12. In a telephone system. a telephone line, means including a multi-brush con nector switch for establishing a connection to said line, a brush selecting device at said switch, a'single terminal set for said line at said switch, controlling means for said brush selecting device diflerently operative to vcause said brush to select and make op,- erative the same brush set, a source of ringing current, means for moving the selected brush set ,into engagement with said ter niinal set, and means dependent on the manner of operation of'said selecting device for joining said circuit to oneor the other of the talking conductors of saidline.

In'a telephone system, a calling line and awcalled telephone line, two telephonestations on said called line, signaling devices at said stations respectively, said naling devices being connected one to each oil-the conductors of said called line, means including a multiebrush connector switch for; establishingiz' a connecticn trcni said calling to said called line, a brush selecting device at said switch, a single terminal set for said called line at said switch, controlling means for said selecting device differently operative to cause said device to selectthe brush set having access to said terminal set, means for moving said selected brush set to make connection to said terminal set, a source of ringing current, and means dependent on the manner of operation of said selecting device for joining said source to one or the other of the conductors of said called line. v

14. In a telephone system, a telephone line, two stations on said line, signaling devices at said stations respectively, said signaling devices being connected one to each of the conductors of said line, means including a multi-brush switch for establishing a connection to said line, a single terminal set for said line'at said switch, a rotatable brush selecting device -'at said switch, controlling means for said selecting device for causing it to assume a position to release the brush set having access to said terminal set by passing through either less or more than a complete 'rot'atio'n, means for moving the-selected brush set into engagement with said terminal set, a source of current, and means dependent on whether sa-id 'selecting device was moved through less or'more than a complete revolution for oining said source to one or the other of the conductors of said line.

15. In a telephone system, a telephone line, two stations on said line, signaling devices at said stations respectively, said signaling devices being connected one to each of the conductors of said line, means including a multi-brush switch for establishing a connection to said line, a rotatable brush selecting device at said switch capable of being moved through a plurality of cycles of brush selecting positions; the brush selected at corresponding positions of said cycles being the same, controlling means for said'brush selecting device for causing it to assume a position to'select the brush set having access to said telephone line by passing through less or more than a cycle of positions, a source'of current, and means dependent on the manner of operation of said selecting device for joining one or the'other poles 'ofsaid source to said line.

16. In a telephone system, a telephone line,

two stations Oh said line, signaling devices at said stations respectively, said signaling devices being connected one to each of the conductors of said line, means including a inulti-brush switch for establishing a connection. to said line, a rotatable brush selecting device at said switch, means for moving said device through a plurality of cycles of brush selecting positions, the brush selected at, corresponding positions'of said cycles being the same, a single terminal set for said called line at said switch, controlling means for said brush selecting device differently operative to cause said device to select the brush set having access to said terminal set, means for moving the selected brush set into engagement with said terminal set, a source of current, and means de-' more than a cycle of positions, and'means whereby said switching device will not be operated if said selecting device in moving to a position toselect said brush passes through less than a cycle of positions.

18. In a telephone system, a multi-brush switch, a brush selecting device, means for moving said device tl'i'rough a plurality of cycles of brush selecting positions, said de vice being arranged to select the same brush when moved to either'o'f its corresponding positions, a relay, means for causing the en'- ergization of said relay if said'select'ing device is moved to a position to select a desired brush by passing through more than a cycle c of positions, and means whereby said relay will not be energized if said selecting device in moving to .said position passes through less than cycle of positions. e

19. In a telephone system, a multi-b'rush switch, a rotatable brush selecting device,

means for causing said device to assume aposition to select a certain desired brush by moving it through lessor more than a complete rotation, a relay, means for energizing said relay if said selecting device is moved 1 to a desired position by passing through 7 more than a complete revolution, and means whereby said relay will not be energized if said selecting device in moving to said positio'n passes through less than a complete rotation;

20. In a telephone system, an electrically operated rotataibleswitching device, means for moving said device to a'desir'ed selecting position by passing through more or less than a complete rotation, a relay and means forv energizing said relay only when said switching device is moved through a complete rotation or more. V I v 21. In -'a telephone system, an electrically operated switching device, a plurality of series of selecting positions for said device, the selection effected in corresponding positions of said series being the same, a relay and means controlled by said switching device in passing from one of its series of positions to the next for energizing said relay.

22. In a telephone system, a telephone line, means including an electrically operated switching device for establishing a connection to said line, an operators sending device, including a register having a plurality of series of corresponding contacts, the corresponding contacts in the two serles, being arranged to control the sending of series of different numbers of impulses, means for operating said selecting device under the control of corresponding contacts of either of said sets to effect the said selecting operation, and a second register for determining which of the sets of contacts of the first mentioned register will be operative.

In witness whereof, we hereunto subscribe our names this 17th day of January, A. 1)., 1916.

FRANK N. REEVES. ALBEN E. LUNDELL.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. G.

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